Asciminib monotherapy in patients with CML-CP without BCR: :ABL1 T315I mutations treated with at least two prior TKIs: 4-year phase 1 safety and efficacy results

Michael J. Mauro, Timothy P. Hughes, Dong-Wook Kim, Delphine Rea, Jorge E. Cortes, Andreas Hochhaus, Koji Sasaki, Massimo Breccia, Moshe Talpaz, Oliver Ottmann, Hironobu Minami, Yeow Tee Goh, Daniel J. DeAngelo, Michael C. Heinrich, Valle Gómez-García de Soria, Philipp le Coutre, Francois-Xavier Mahon, Jeroen J. W. M. Janssen, Michael Deininger, Naranie ShanmuganathanMark B. Geyer, Silvia Cacciatore, Fotis Polydoros, Nithya Agrawal, Matthias Hoch, Fabian Lang

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Asciminib is approved for patients with Philadelphia chromosome–positive chronic-phase chronic myeloid leukemia (CML-CP) who received ≥2 prior tyrosine kinase inhibitors or have the T315I mutation. We report updated results of a phase 1, open-label, nonrandomized trial (NCT02081378) assessing the safety, tolerability, and antileukemic activity of asciminib monotherapy 10–200 mg once or twice daily in 115 patients with CML-CP without T315I (data cutoff: January 6, 2021). After ≈4-year median exposure, 69.6% of patients remained on asciminib. The most common grade ≥3 adverse events (AEs) included increased pancreatic enzymes (22.6%), thrombocytopenia (13.9%), hypertension (13.0%), and neutropenia (12.2%); all-grade AEs (mostly grade 1/2) included musculoskeletal pain (59.1%), upper respiratory tract infection (41.7%), and fatigue (40.9%). Clinical pancreatitis and arterial occlusive events (AOEs) occurred in 7.0% and 8.7%, respectively. Most AEs occurred during year 1; the subsequent likelihood of new events, including AOEs, was low. By data cutoff, among patients without the indicated response at baseline, 61.3% achieved BCR::ABL1 ≤ 1%, 61.6% achieved ≤0.1% (major molecular response [MMR]), and 33.7% achieved ≤0.01% on the International Scale. MMR was maintained in 48/53 patients who achieved it and 19/20 who were in MMR at screening, supporting the long-term safety and efficacy of asciminib in this population. [Figure not available: see fulltext.].
Original languageEnglish
Pages (from-to)1048-1059
Number of pages12
Issue number5
Early online date2023
Publication statusPublished - May 2023

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